Extragalactic radio surveys in the pre-Square Kilometre Array era

Area of Science:

• Radio Astronomy
• Extragalactic Astronomy

Background:

• Six decades of low-frequency radio continuum surveys have advanced understanding of extragalactic radio sources.
• Complementary observations across the electromagnetic spectrum are crucial for comprehensive analysis.

Purpose of the Study:

• To review current knowledge of extragalactic radio sources.
• To discuss the relationship between radio survey data and other wavelengths.
• To identify outstanding questions and outline future prospects.

Main Methods:

• Synthesis of six decades of low-frequency radio continuum survey data.
• Integration of complementary observational data from other wavelengths.
• Analysis of relationships between different survey datasets.

Main Results:

• Consolidated understanding of extragalactic radio sources based on extensive historical data.
• Established connections between low-frequency radio properties and observations at other wavelengths.
• Identification of key areas for future research.

Conclusions:

• The upcoming Square Kilometre Array era promises significant advancements.
• Continued multi-wavelength observations are essential for deep understanding.
• Outstanding questions in extragalactic radio astronomy are highlighted for future investigation.